Simulation of Gas-Liquid Two-Phase Flow-Induced Corrosion at Premium Connection in High Productivity Gas Wells Containing CO2

Numerical simulation was carried out to investigate the gas-liquid two-phase flow-induced corrosion in high productivity gas wells containing carbon dioxide. The Eulerian-Eulerian multiphase model combined with the electrochemical corrosion model was applied to simulate the corrosion rate at the tubing thread connection induced by corrosive medium containing carbon dioxide. The predicted corrosion rate was compared with the field data in the literature. It is shown that the predicted results were conservative when merely considering the phase distribution. Qualitative analysis between the predicted phase distribution, flow characteristics, erosion-corrosion position and the field data was made.

Experimental Study on Flow-Induced Corrosion of Casing and Tubing Steel for Heavy Oil Thermal Recovery Wells

The tubing and casing in the thermal recovery well are subjected to corrosion damage of multiple thermal fluid flow during the service period, which may cause safety accidents such as thinning, perforation and even fracture of the pipe wall. In this paper, the corrosion behavior of J55 casing steel and N80 tubing steel in flowing media were studied by using high temperature and high pressure reactor. The test results reflected the effects of single gas concentration and temperature of O2 and CO2 on tubing and casing corrosion. Comparing and analyzing the corrosion law of tubing in distilled water and produced water, the results of column corrosion rate under hot steam injection and production conditions were obtained, which indicated the difference of corrosion and the influencing factors of tubing in two working conditions.

The Effect Mechanism of Hydrodynamic Factors on Naphthenic Acid Flow-Induced Corrosion

Hydrodynamic factors are the important factors affecting the flow-induced corrosion of naphthenic acid. The effect mechanisms of hydrodynamic factors such as flow velocity, flow pattern, erosion angle and multiphase flow, etc. on the flow-induced corrosion of naphthenic acid are analyzed comprehensively, and the effect mechanisms of critical hydrodynamic parameters such as surface shear stress and near-wall turbulence intensity, etc. on naphthenic acid corrosion are explained. It is pointed out that in the flow-induced corrosion system of naphthenic acid, hydrodynamic factors such as flow velocity, flow pattern, erosion angle and multiphase flow, etc. influence the erosion intensity and mass transfer process generally by changing the magnitude of surface shear stress and near-wall turbulence intensity, thus affecting the severity of corrosion.